In Malta, the ancient temple of “Ħal-Saflieni” is the only prehistoric underground temple in the world. It dates back to nearly 3,500 years ago and holds a unique secret: Its structure resonates at 111 Hz, or the 'holy frequency.' This resonating frequency isn't just restricted to one room. The builders of that era created a series of phenomenal temples with mirroring underground catacombs, all resonating at 111 Hz.